Detonating burglar-alarm.



nohwmvaf PATENTBD MAR. 19, 1907. A.V.TODD.

DETONATI NG BURGLAR ALARM. APPLIUATION I'ILED'MAY 17, 1905.

ALBERT V. TODD, OF DENVER, COLORADO.

DETONATING BU RGLAR-ALARM.

Specification of Letters Patent.

Patented March 19, 1907.

Application filed May 17, 1905. Serial No. 260,755

a, whom it may concern.

Be it known that I, ALBERT V. TODD, a citizen of the United States,residing at the city and county of Denver and State of Colorado, haveinvented certain new and useful Improvements in Detonating Burglar-Alarms and I do declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanying-drawings, and to the letters and figures ofreference marked thereon, which form a part of this specification.

My invention relates to improvements in alarms of the class adapted moreespecially for use in connection with doors and windows, whereby theopening of the door or window will release a spring-actuated plungerwhose movement explodes a cap or cartridge as the case may be, wherebynotice is given of an unauthorized attempt to enter a building or room.

The object of my invention is to provide a device of this class whichshall be simple in construction, economical in cost, reliable, durable,and eflicient in use; and to this end the invention consists of thefeatures, arrangements, and combinations hereinafter described andclaimed, all of which will be fully understood by reference to theaccompanying drawing, in which is illustrated an embodiment thereof.

In this drawing, Figure 1 is a front view of my improved detonatingalarm. Fig. 2 is a side elevation of the same. Fig. 3 is a view of thedevice in use. Fig. 4 is a fragmentary view showing a modified form ofconstruction. Fig. 5 is a fragmentary view of a window illustrating myimprovement applied.

The same reference characters indicate the same parts in all the views.

Let the numeral 5 designate a bar whose lower extremity is provided withteeth 6, adapted to enter the floor of a room. The opposite extremity isprovided with a device 7, having teeth 8 at one extremity, its oppositeextremity being beveled, as shown at 9. This sliding part 7 is providedwith a slot 10, through which two screws 12 are passed, whereby thesliding device is movably connected with the upper extremity of the bar5. Just below the device 7 are located two lugs 13, one on each side,their upper edges occupying alposition at right angles to the bar 5,

whereby either of the said lugs forms a support or stop for thehook-shaped extremity 14 of a plunger, slidably mounted on the bar 5.This plunger passes through openings formed in projections 16 and 17,suitably separated, and, as shown in the drawing, formed integral withthe said bar. The lower extremity of a coil-spring 19 is con nected withthe plunger, as shown at 18, the 1 upper extremity of this springengaging the stop 16. The lower part of the bar is provided with acartridge-holder 20, in line with the plunger 15. In the drawing acartridge 21 is shown in position and is held in place by a leaf-spring22, secured to the bar 5, its lower extremity pressing against the rimof the cartiiidge, whereby the latter is held securely in p ace.

When the device is applied to a door, it occupies the position shown inFig. 3. The plunger is drawn up against the spring 19, whereby thelatter is placed under tension. The hooked extremity 14 of the plungeris then thrown to engagement with one of the lugs 13, as shown in thedrawing. One extremity of the plunger-releasing device 7 engages thedoor, while the opposite extremity of the bar engages the floor of theroom. The releasing device while engaging the door is resistedsufiiciently by the hooked extremity of the plunger to cause the deviceto remain in position, the teeth 8 being reasonably sharp. Now if aneffort is made to open the door the inward thrust will be suflicient toforce the releasing device downwardly, whereby its beveled lowerextremity will crowd the hooked extremity 14 of the plunger off from thelug 13, in which event the recoil of the spring 1 9 will throw theplunger forcibly downward against the cartridge and explode the same.When the device is used in connection with a window, it is secured tothe sash 23 by means of one or more fastening devices 24. In this eventa device 25 is applied to the window-frame and adapted to engage thehooked extremity of the plunger to disengage the same from the lug 13,ifan attempt is made to raise the window.

In the form of construction shown in Fig. 4 the plunger 15 is providedwith an enlarged head A, adapted to pass through an opening B andexplode a cap or cartridge O of special construction or different fromthat shown in the other views. The bar is provided at its lowerextremity with a guard-plate 26, locatedbelow the cartridge-holder andis adapted to prevent the possible sparks or fire resulting from theexplosion of a cartridge from passing downwardly against the i surfaceengaged by the lower extremity of l the bar. In case it is a carpetedfloor the spark or fire resulting from the explosion of the cartridgemight possibly ignite the car- 1 pet. In any event the plate 26 isdesirably employed as a safeguard against the possi bility mentioned.

Having thus described my invention, What I claim is In a detonatingburglar-alarm for doors, the combination of a bar toothed at its lowerextremity to engage the floor and provided With a cap or cartridgeholder at its opposite extremity, a spring-actuated plunger mounted onthe bar intermediate its extremities, the upper extremity of the plungerheing hook-shaped, an exposed lug mounted on the bar on each side of theaxis of the plunger, i

the said lug l orn'iing a stop for the hooked end oi the plunger andadapted to hold the latter against the tension ol its spring, and adevice slidahly mounted on the hur, one extremity of the slidahle deviceheing adapted to engage the door, While the other end is beveled andlocated adja r-eut the hooked extremity oi the plunger \vherehy as forceis applied to the slidahle device its beveled end acts to (,lisengagethe hooked, extremity ol' the plunger from the said lug, thecartridgeholder heing located in line with the plunger wherein: themovement of the latter under the influence ol its spring acts to explodethe cartri I go or cat In testimony whereof I atlix my signature inpresence o't' two witnesses.

i liBlClt'l. Y. 'lUlH). itnesses DENA NnLsoN, BURT L, ltlIOADS.

